It's such an intimate sort of gesture that it makes Q's heart skip a little, and his kiss turns tender, his free hand coming up to grip the back of John's neck. He rolls his hips against John's, taking him as deep as possible with each movement.
It's not long after that he shudders again, body tensing, muscles clenching around John as he breaks the kiss to gasp his way through his orgasm. He trembles and throws his arms around John's shoulders with a shout, clinging to him as he rides out his climax.