From the way Gamzee's reacting, he doesn't seem to be bad at it? The Slytherin certainly seems pleased, and one hand roams up and down Tavros's back as he makes another low sound into the kiss, and it seems like his hand might even wander lower-

A loud throat clearing interrupts the pair, and then several horrified looks from other Huffleuffs at the table who have been forced to bear witness to this impromptu make-out session. Gamzee lifts his head with slightly dazed eyes, but there's a brief moment when they narrow and look remarkably sharp as he fixes the unfortunate interrupting student with a hard look.