We're having a weekend-long family gathering and everyone is in bed for the night. I woke up in the middle of the night and decided to come downstairs for some water. I go into the living room and find you there still awake. Now that we're finally alone together, I decide to bring up something that's been on my mind for quite a while now. Every time we have a family meet up I notice you constantly checking out my tits. I feel really conflicted about it. On the one hand you're my sister's husband and I feel kind of disgusted/guilty about the whole thing, but on the other hand it kind of turns me on. Things with my husband have been on the steady decline. He's gotten so fat over the years, not nearly as built and hot as you. We don't have good sex anymore. I feel like he's stopped appreciating my huge tits and I just want to feel sexy. Maybe we should indulge in our desires just this one time. Maybe we can just get it out of our system, just this once, and things won't feel so awkward between us anymore. If I just show you my tits while you jerk off to them then that's not so bad right? I mean its not like we're touching or anything like that and its been so long since someone has covered them in a huge load of cum. We obviously wouldn't tell anyone and they're all in bed right now so no one would know. Would you like that? Ok I'll start taking them out while you show me how big and hard you can get your cock for your big-titted sister-in-law