i got carried away at my engagement party

so i just had my engagement party last week and there were a lot of people. its small town so everyone knows everyone but my fiancee works with one girl who we call sasha (not her real name, she has two first names). anyway, sasha is in her mid twenties and really pretty and very flirty. the night went well until after dinner when i had just a few drinks. sasha was sitting next to me and kept touching my hand and thigh under the table during the speeches which made it hard not to pay attention to how soft her skin felt. later when we were dancing (my fiancee is conservative about physical stuff like that), sasha leaned in close to say something to me as i held her against me for a second and then she whispered