At the first go, Theo thought that he was doing something wrong as expected lips did't meet his own but instead pinned something against either side of his mouth; the gentle moves had Theo relaxing into almost liquid in Greg's arms, soft and malleable and warm and twinging just a little with a sexual tension he neither really noticed nor understood.
He kissed back when Greg finally connected their mouths, whimpered softly when the kiss was removed but kissed back thirstily again when Greg showed that he wasn't just leaving, that he was bringing his mouth back. He drifted somewhere between a nowhen time and school and almost purred in Greg's arms.