Neither of them has a problem with this, but Orlando privately wishes Brad could be persuaded to do more than watch. He knows Sean feels the same, and they've been working on him. After all, they're not asking for declarations of undying love, and Jennifer is a long way away.
When Orlando feels a hand stroking his back, at a moment when Sean's hands are... occupied, he's delighted but not surprised. He rolls sideways and makes space for Brad.