Best friends widow

So my best friend died a couple years ago. Me and his girl have gotten close. I am early 20s she’s early 30s. She’s beautiful slim thick. Thighs thick perfect round ass. We have gotten super close. To the point where we are sending nudes. Talking about what we would do to each other all the good stuff. I want to fuck so bad but don’t know if I should. We are both consenting and she begs to throat my dick. Throwing her ass on my dick turning me into her sexy toy. Said she knows I will satisfy her like no one else. I get hard jsut typing this. What should I do it fees so wrong but so right.