I don't know why this is considered BDSM by some. There's abuse, yes, but it's not sexual and it's not consensual. It's abuse. The word "submission" is used twice and "dominate" once. These are used in the context of allowing himself to be loved, not controlled. The other guy uses dominate as a contrast to the latter, that the other man is willing to submit to his love. The sex is equal. The romance itself is sweet.
I liked that this is in a series, although I read them out of order quite a while a part. The stories were so similar I was confused for quite a while not sure if I'd read this one already.
Happy ending? Yes, HEA.