Post-dark side but pre-Darth Vader, Anakin overpowers Obi-Wan and has his way with him, taunting him all the while about how he's always denied that he wants Anakin. Obi-Wan protests and fights back all the way, even as his body (and mind) respond so powerfully.

Bonus for Anakin using the Force to make Obi-Wan more aroused/submissive, and Obi-Wan being painfully aware of it.