He doesn't necessarily, however spoiler*
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After locking Dane in a bunker underground pleading to sleep with him once to confirm his suspicions about his secondary gender, along with his pheromone compatability Dane ends up going into heat unexpectedly. Grayson feels as if he's been pounced upon and so Dane (from what I read) gives in and from that point on their relationship together becomes more present as well as frequent. Grayson can't get enough of Dane or his 'venus' lol.

how tf is grayson gonna convince dane to bottom