Andrew hadn't been fully sober when he'd experienced his rut, and because his pheromones weren't fully stable at the time, it wasn't better for him to ride out the whole rut by just having sex.
Yes, he had spent that one, whole day tormenting Maxwell, but after that, they had him on rut suppressants that were supposed to work on true alphas. Thankfully, they did, and Maxwell and Andrew could go about their regular days after that. So Andrew had an idea of what a heat was going to be like, but he didn't know.
It wasn't until 12 hours in that everything settled into place.
He had been right to worry that Maxwell was going to want to ring him dry of every ounce of semen in his body, so he had come up with other options. Leading Maxwell into…different ideas.