They hunt for a top, but can almost never find one, because they are too picky:
1. Has to be fit, because they have to have good stamina to fuck them both to satiation.
2. Cannot be too ugly, because if they accidentally look at him, they don't want to love their hard on's.
3. MUST NOT TOUCH OR KISS. Dick will absolutely stop everything and kick him the fuck out if he puts his hands on Jason, and having someone who is not Jason touch him feels icky.
4. Must be happy being a human dildo. They will do nothing for him except bounce on his cock, and they should be happy with that.
5. Has to keep quiet. Jason finds it weird to hear someone who is not Dick moan, it's a turn off for him.
6. Has to leave immediately afterwards, because that is Dick and Jason's cuddle time.
7. Has to be okay with sitting in the cuck chair some times, because every once in a while the plan to get fucked gets derailed by Dick edging Jason and by the end of it, they didn't even need their human dildo. And again, they will do nothing for him.