Confessing something from my senior year. My TA (F28, married) was insanely hot and always flirted with me during office hours. One night our study group was meeting in the library.

While my girlfriend was literally sitting 10 feet away working on the same project, the TA texted me to meet her in the stairwell. I went, she pushed me against the wall, pulled my cock out, and rode me standing up until I came inside her. We were back in the group 15 minutes later like nothing happened.

I still get hard thinking about how risky it was. My girlfriend never suspected a thing.