Fro[M] jerking off to her sister's ass to [F]ucking her in the next room

Tl;dr: as soon after I jerked off to my younger gf sister (Ellie) bare ass, I fucked my gf (Jess) too.

So a quick recap, after having mistakenly groped Ellie's ass I ended up jerking off with her showing me her ass in just her thong. She locked the door and I was still shaking, I couldn't believe what the fuck just happened. And John (Ellie's gf) and Jess were right there in the same hotel room I was fucking shocked.

I pulled my pants up, I cleaned the floor and layed on the bed since the bathroom was still being used by my gf. Still had a boner, I cleaned myself as best as I could but I wanted to wash up. I was still thinking about her ass and what happened, I was both feeling extremely guilty and extremely still aroused. I could have fucked her but I would have cheated. I love my gf. Fuck, what a fucking mess. I didn't know what to do, what to say to Jess.

As soon as I've heard the bathroom unlock I sprinted towards the bathroom. Just to get you up to speed my gf usually takes long bath to wash off the effect of alcohol and smoke, but she usually gets pretty horny nevertheless (I mean she is pretty horny all the time luckily).

I was there on the door and she was just wearing the bathrobe, remember once again, I was in my PJ's but no underwear, so my boner was showing.

"Mhh you were so eager that you sprung here?" As she jokingly looked over at my cock.

"Yeah yeah I know the effect of a long bath on you, but I have to wash myself first"

She almost carelessly, looked over my shoulder not letting me in, "Where's Ellie?" "She went to sleep, she was tired" fuck I'm soo bad, I fucking suck goddamn.

"Good" she completely dropper her robe on the floor. Fuck she is hot still, nice round tits, C cup, a bit curvy and there with a mischievous face I saw hundreds of times. I was still aroused from what happened before, this vision just made me even hornier, but I had to clean myself, she would know otherwise.

"Mhh you are such a good girl, let me squeeze in, I'll wash and we can do whatever you want" She didn't let me in "Don't you like the feeling of being seen? Especially by Ellie and after this afternoon?" I just swallowed saliva, fuck fuck fuck what do I do now? Fuck I'm soo horny again. I couldn't even collect my thoughts that she dropped on her knees and popped my dick out of my PJ's.

I was terrified, I tried to oppose "wait I have to-" my cock was in her mouth, too fucking late. Fuck fuck fuck fuck I was terrified and my cock kinda started to went limp as well. She looked confused and said "Do you really got that aroused this afternoon that you actually leaked precum?" Fuck, what do I do?! "Mhh yes a bit" admitting this was far easier than admitting almost cheating. She was really horny I could tell by her eyes "you are such a bad boy, I really like it" and she went back on sucking me. The relief and the skills of my gf made me hard back on without even thinking.

She started touching herself and going deeper and deeper. Fuck I was in complete ecstasy, I pushed her head deeper and she moaned bobbing her head more. "Shhh" I said, "Oh don't shush me, I know you are enjoying this thrill as much as me". Not gonna lie, she was completely right, thinking I just jerked off to Ellie and now Jess was there kneeled down on me gave me such a sense of power and lust that my head almost started spinning.

"I want to fuck you doggystyle here and now" she smirked "well that was a swift change of idea" She stood up, turned around, place the hands on the door handle and presented her ass to me. In that moment, I thought that Ellie ass really was superior, Jess was by far thicker but Ellie's was more rounded and fit. I proceeded to fuck her and of course thinking about Ellie's ass. Jess was soo much wetter than expected, and that means I could fuck her harder without cumming combined with the fact that I just came, I felt on top of the world.

In the silence of the room, I started fucking her slow not to cause too much noise but soon enough lost all control, the distinct slapping of our wet bodies echoed in the room. She started moaning as well, I couldn't shush her "are you imagining my sister ass?" Said in between moans "yes I cannot think of anything else right now" fuck I completely slipped I'm too fucking horny. She moaned more and her legs shook a bit, she continued "that's soo fucking hot, keep going and don't stop, fuck me like you would fuck my sister"

I think I blacked out.

I know I wanted to check over her sister room to check if it was still closed but I'm that moment, that phrase pushed me over the edge. I gripped hard her ass, opening it up, and showing her asshole spreading a bit too, and fucking her harder than ever and cumming deep into her. We both had a legs shaking orgasm.

We cleaned up, and went to bed, she was really greatful for the great fuck, and thought that making me thinking of Ellie was cute and hot.

While falling asleep I thought that in the end I haven't checked up on Ellie's room, could have she heard us?