How do you get a heart for Xer?? -ε-
i will try to help you, but you would excuse me since it has been a while when i played the game..
if i'm not mistaken, (at the good end of the ruin) after massaging Xer... some how conversation pops up to tell him about your adventures.. if you choose to tell him the naughty ones. your relationship with him would expedite and within that duration you would get your heart..
If I remember correctly, when you talk with Xeroth one of the options is called "Slutty Tendencies," and he'll ask if he can dominate you. If you say yes, you get the heart. When I do it he mentions how I submitted last time I sparred with Rhot, so you may need to do that for it to work, though that might just be a bit of flavor text.