Theo made a sound that he would have sworn up and down wasn't a yelp as Greg dug fingers into his ass, catching his breath again and panting for air when Greg let go, unaware he'd even been holding his breath after that last sharp sound. He lifted up to squirm his pyjama bottoms down as he tugged down Greg's, returning the kiss with a small sound of enjoyment, rubbing down against Greg's erection as the other Slytherin lifted him.
"Hm, bird bones?" he suggested between kisses. "Maybe you just don't know your own strength?" he smirked, reaching down to curl his hand firmly around Greg's cock and start stroking it.