He's a healer. He needs to master the ability to heal himself mid banging, train his stamina using healing magic.
Also, while I understand why people complain about the nipples. As an absolute degenerate, I'm quite happy with them since for the type of nipples the artist is going for, they're fine.
I'm a lover of all sizes of breasts and all sizes of nipples. The giant areola are uncommon, but there is a market for it. But I do understand why it can turn some people off. Maybe some people would've enjoyed having one of them with inverted nipples, though those also come with the usual caveat that once they pop out, they usually end up looking large, though there are the rare occasion when the nipples coming out are actually petite.