I love that his cock his locked up. Few things make you feel more under her control than having her take your ass while she prevents you from even getting hard from the feeling.
In the same way the strap running between her legs prevents access to everything there she’s taken your cock out of the equation too.
She’s altered the equation so her cock in your ass is not only a solution, it’s the only solution.
For the addition to the caption. Much better said than I could have done (and did do) myself.