[MFF] Strained Roommate Situation

Background:
My gf [F22] and I [M28] started dating roughly a year and a half ago and she’s been a great partner and guide to helping me be more comfortable and confident with myself sexually. My gf has had the same closenit group of friends and we ended up moving in with one of her friends (we’ll call her Sally [F21]) about a year ago (6 months into the relationship). The apartment that we moved into consists of two bedrooms that connect to a shared living room/kitchen area with a shared bathroom on the other end of the living room.

Situation:
As a roommate and long time friend, Sally is fine. Nothing happened in the first two months. However, I began noticing that everytime after sex, Sally would look slightly flushed or sweaty when coming out of her bedroom (next to my gf/my bedroom) or generally wherever she’s at. I honestly felt rather shitty about this as I didn’t want to inconvenience or cause any frustration on Sally’s part. In hindsight I should have mentioned it to my GF, but I feared some kind of argument might arise stemming from something like “why are you imagining things about my friend?”. So I just kept it to myself and I stopped caring about it. I assumed if Sally didn’t bring it up, then I wouldn’t point it out or put her on the spot. Starting roughly 2-3 months ago, I happened to realize that some of the condoms, tissues/papertowels used to clean up (sexual activities or jerking off) in my room’s trashcan have been missing. Not like I actively keep tabs of the inventory of my trash, but I know for sure I didn’t dump the trash so the periodic condom should be there. Gf confirms she doesn’t empty that one as it’s usually the trashbin I empty.

I brought it up with my gf that Sally might be taking the condoms and tissues and surprisingly the news was a big turn on for her. She wanted to test this and first made sure that Sally was in the living room. Then she blew me and as I came into some tissues, she practically yelled out about how big of a load I came (avg at best imo). As we came out, Sally looked as though she heard nothing. GF and I then make a show of getting ready to go to a bar, but really we just left, walked around the block, and quietly came back in through my back patio door. We ended up finding Sally in the bathroom (back to us) rubbing her toothbrush in the tissue. After the initial surprise and embarrassment wore off, Sally confessed that she gets off to hearing us while also confirming that she’s been stealing the condoms and tissues. She had been drinking and pouring the cum onto herself while licking and smelling the tissues to get off as she listened to my gf and I. I was slightly disgusted initially as I’m ultra vanilla when it comes to my actual personal relationships, but my gf asked her to show us what she was doing earlier. Sally had originally planned on brushing her teeth with the cum from earlier and proceeded to awkwardly start doing so. My gf started pushing her and egging her on and the awkward toothbrushing slowly looked closer to sucking and fellating.

While I was disgusted initially, I was struggling to deal concealing my hard on now. I’ve never gone over the edge and cheated on my GF and was scared of how things might end up changing for our relationship. I pulled my GF into our bedroom and fucked her as she purposefully moaned louder. It honestly didn’t last that long from being so turned on by the show earlier and as soon as I mentioned I was close, my GF pushed me off had me cum in another tissue. This time, she didn’t toss it in the trash, but went to the living room where Sally was still sitting and gave it to her.

A few days passed and we didn’t talk about it much, but I was approached by both in the afternoon and they both wanted to ask how I felt about including Sally. While this might seem like everyone’s dream come true, I was apprehensive to the idea as I genuinely love my gf and don’t want to let my lust implode everything. Groundrules were laid out regarding me and Sally, Penetration is fine if gf is present and anything else is fine alone with the two of us so long as we let gf know.

At first things were really hot and sexually charged. bucket list items were knocked off i.e. two girls making out with my cock in the middle. But now things have mellowed out and as opposed to jerking and tossing a tissue, I use condoms to jerk off (yes kind of weird) and give a tied used condom to my roommate. Maybe I’m too vanilla, but I guess the next step would to have this transition into a free use situation. Not sure how to really end this, but I never thought I’d end up in a situation like this ever. Might update if anything outside the ordinary happens or just ama in the comments I guess.

Source: reddit.com/r/gonewildstories/comments/tfuhxn/mff_strained_roommate_situation