...I've legit never heard of "Massage Fic" before, but I'm assuming it's a fic in which someone gets/gives a massage? I don't know, but between that presumption and the hair brushing/braiding I'm thinking...

Maybe Ulfr either asks for a massage or she starts giving him one (requested or not), but instead decides to play with his hair? Generally his is long enough to kinda braid, might be kinda cool looking if done right (or silly/cute if not), lol!! A fic with them in the opposite positions is also possible, but honestly not as interesting to me...probably because I just know it'll end in sex, because it's Ulfr and, haha, that'd be his entire goal giving the massage or just about anything intimate, LOL!!

((Only picked this gif because people are doing his hair, lol!! Anyway, don’t know if that answer was any good, but it’s all I got, sorry, @ultrarebelheart, lol!!))