Imagine being loved by me! (слэш)

“I think he's being unfaithful to me,” Severus admitted close to his ear, three glasses in and with the fourth dangling off his pale hand. Harry had turned around once again and was unsubtly pushing his bottom against him, after the two glasses and shot of vodka took his shame away. “With Black.”
Harry would honestly love to be surprised by the idea, but not really.
*
or: Harry takes his chance and gets all he's ever wanted.