I had only been in my new flat for six weeks. I had seen Claire and Frank around, but as yet hadn't talked to them. That was about to change. Whilst I hadn't seen much of them, I had certainly heard plenty from them. Their bedroom must have backed on to mine as night after night I could hear Frank having his way with Claire. Neither of them were quiet with it and besides the moans and groans and the grunts, both were quite vocal. It was getting close to Christmas and I had just got in from Christmas shopping when the door bell went. I opened the door and there stood Claire. She is what I would call a compact model, but well scaled and quite pretty. "Have you got my key?" she asked. I must have looked daft as I had no idea what she was talking about. "Simon kept it in the cupboard," she informed me. Simon was the previous owner of my flat. It still meant nothing to me. Claire just brushed past me and went to a section of wall and pressed. A door sprung open. I didn't even know it was there. "Here it is," she said holding up a key, "it's the spare key for my flat," she informed me. Then she brushed past me and was gone. A few days later the doorbell went again. There stood Claire. "I need to put the key back," she informed me and brushed past and opened the concealed panel and returned the key. As she explained that she was bad with keys and would leave them all over the place and even lock them indoors as she had a few days back. As she told me this I offered her a coffee. She said yes and she was dying for a coffee. As we sat drinking the coffee she informed me that Frank was her boyfriend. I told her I had seen her with him. Then she laughed and said, "You must have heard him." I told her it was hard not to hear them. She apologized and I told her not to worry and that I found it sexy and exciting. She also informed me that she also had a spare key to my flat that Simon had left one with her in case he had problems. She told me that due to his health she would often pop in to see he was ok. I told her to keep the key as it made sense for someone else local having a spare. As we talked I noticed that she was very tactile and touchy feely. Her hand had touched mine lots of times and her foot had contacted my legs several times. Then she left for her own flat. It was just a few days before Christmas and I was in the shower when I got this strange feeling that I was being watched. I turned around to see Claire stood there looking straight at my cock. My cock started to grow with excitement knowing I was being watched. I turned the shower off and exited the cubicle and reached for a towel. I heard a small groan from Claire as I covered myself up. My cock was forcing a tent in the towel where it was now quite hard. "Sorry, The delivery man couldn't get a reply from you so he left this parcel with me. I tried ringing the door bell and you didn't answer, so I thought I'd drop it inside for you. Then I heard running water and came to see what it was and that you were ok.," she informed me. I told her I was ok. Claire gasped I can see that as she looked at the tent in my towel. I took a step towards her to take the parcel and my towel fell to the floor. Claire had taken a step towards me, but it wasn't the parcel that was on her mind. Claire's hand grabbed my cock and started to play with it and wank it. My hand went to her beautifully formed tits and I soon had them free from her blouse. Claire dropped to her knees and started to suck my cock. I continued to play with her tits. Claire might have been fairly small but she could certainly handle a cock as most of mine disappeared into her mouth and throat. I couldn't take a lot of her sucking or I would have come. I lifted her to her feet and then picked her up so we were both at the same height so I could kiss her. As we kissed and I held her clear of the floor her legs slipped around me and locked behind my back. Her arms had also entwined themselves around me. I moved one and then the other hands to her arse under her skirt. She might be small, but she was also quite muscly and I had two very nice handfuls of her arse. Claire was kissing me as much as I was kissing her. I tried to get fingers inside her panties. I had to pull them to one side with one hand and then insert fingers from the other hand. Her pussy was pretty tight as two fingers eventually slipped into her pussy. Claire groaned as they plundered her pussy and then she said, " Fuck me." I lifted her slightly higher with one hand, and after removing my fingers, used the other hand to aim my cock and then lowered her onto it. I heard that groan, the one that I heard night after night as Frank fucked her, only this time it was my cock fucking her. Now my cock was full embedded in her pussy, it was easy to use both hands and lift and lower her almost like a doll as she took my cock in her pussy. "Yes, yes fuck me. Use me. make me come," she uttered as I continued to raise and lowered her on my cock. "Arrrrgh, don't stop. Aaaah," she gasped as she came. I continued to use her on my cock to bring myself to orgasm. Then I was coming deep in Claire's pussy. I was struggling to stand and hold Claire so I lifted her off my now wilting cock and lowered her to the floor. Claire went the few paces to the toilet and pulled her wet panties off and sat on the loo and peed. As she peed I dried myself. Then Claire grabbed my cock again and as she sat she sucked my cock back into her mouth. It wasn't long before we were on my bed and fucking again. We fucked four times that morning. I was treated to see what she looked like when she made all those noises I knew only too well. Eventually she went to her own flat. That was the first night since I had lived there that I didn't hear her getting fucked by Frank. After that wonderful morning Claire would drop in two or three times a month for a morning or afternoon of canal pleasures. She also had me go to her flat and fuck her in hers and Franks bed. To this day I have no idea if Frank knows that I fuck his girlfriend, nor do I really care. Would you? To have a sexy little sex bomb administering to my needs two or three times a month. Even through lock down whilst Frank is at work we have still seen each other, in fact it has been more often as like myself she now works from home. In some ways I wish that lock down never ends.