Dr. Strange thinks he's paranoid, at first. His cape seems to ripple during quiet evenings while he wears it around the Sanctum. It seems to clench his shoulders a little tighter, slide down his back, and trail across his buttocks.
Once in a while, the corner of the cape will roll itself into a sort of tongue. And touch his cheek. It takes the doctor a while to realize he is being kissed.
He considers telling the cape to "stop that" but instead he says, "Affectionate, aren't we?" and the cape seems to shudder with pleasure in reply.
The actions escalate. The cape begins to follow the Stephen Strange in the evenings, now, lingering in the hall like a ghost. It follows him into the bathroom to hang there as Stephen washes in the shower.
It follows him into the bedroom to watch Stephen Strange undress.
One day, Stephen says, "Okay. Come here," and the cape rushes to him like an excited pet. Or an impatient lover.
The cape twists and touches his mouth, jaw, buttocks, perenium, cock. It twists around his member and begins to pull, all the while reaching back to to press against Stephen's silky opening.
The rest of the cape balls itself into a knot and pushes itself into Stephen's mouth. Rough play. Captured.
Stephen grunts and comes.
After, the cape covers his body completely in bed, nuzzling his cheek, the cleft of his buttocks, torturing his nipples.
Stephen thinks the cape is just excited to have figured out a way for them to make love.
The cape has had a taste. Now it wants more.