So I have been teasing my brothers wife. She is 43 full figured and pretty. I am 19 and a fit muscular guy. So I recently moved in with my brother and his wife while I attend college in their town. My brother works evenings so I spend a lot of time with my sister in law. We watch movies, eat dinner together and just hang out. So one evening we were going to watch a movie. I put on some soccer shorts without underwear and didn’t think much about it. When I walked in the room her head snapped to my crotch. She realized and looked away quickly. But this instantly made me start to get hard. I enjoyed it. So throughout the movie I would get up to get water and snacks and would catch her glancing at my bulge which was at this point was a challenge to keep from getting fully hard. Since that night I have been wearing the same shorts on our nights together. She is becoming more and more forthright with her stares and has started to wear tank tops without a bra. Her nipples are very pronounced and I have been fantasizing about something happening. I’ve been sitting on the couch in a way that lets my shorts slide down a bit to give her a good view on my cock. She will turn to talk to me and stare at my cock. But this is my brother’s wife and I can’t do anything with her and she’s more than twice my age! I have been masturbating to the thought and know I shouldn’t do anything but we keep teasing each other and it’s reaching a breaking point. Should I stop this?