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The other Doctor reassures him that this is absolutely vital to his rehabilitation.
It’s hard to argue with his mouth full of- Well, not his cock, not yet. The other Doctor keeps a firm, guiding grip on his hair, dragging him off of Donna’s strap to suck him off. Full one way, full the other. The retired Doctor’s never left abandoned.
He thinks his future self is well-aware of how easily this face has always quieted down with something in his mouth. He’s using that against the retired Doctor, or for his benefit, from another point of view. The retired Doctor slides his tongue along the underside of the other Doctor’s cock to taste every inch of it. He hums as Donna shifts again, beginning to thrust anew.
“Second wind?” the other Doctor asks, and when the retired Doctor flicks his eyes up, he traces the long line of the other Doctor’s arm to behind him, out of view, seeking Donna. He thinks he hears their hands clasp over his back.
“I’m going to have to start doing squats if we make this a regular thing,” she says. She was fucking him faster earlier, but this is good, too, the way she pushes in deep and throws her weight behind every thrust. It feels real, grounding. Donna shoves him forward until he nearly chokes on the other Doctor’s cock, and then it’s her hands on his hips that drag him back again. The other Doctor slips out of his mouth, and he sticks his tongue out, waiting to be filled back up.
“Just wait until tomorrow morning. You have no idea how sore you can get,” the other Doctor leans over him. The retired Doctor is too tall for him to reach Donna, but the other Doctor kisses her somewhere—her hand, her wrist, her fingers, something that makes Donna suck in a breath and smile around her next words.
“You better be worth it.”
“Love, we are,” the other Doctor says, and he reaches down to guide his cock back into the retired Doctor’s mouth where he’s been waiting.