No it is not sinful to have a yf.

I basically agree with what you said.

Mentorship is important both for the younger person and the older person. Yes I am attracted to boys, but like Cat said that does not make having yfs wrong. There is also no need to say you feel that way or any need to feel guilt for the feelings or not telling anyone. Lots of people are attracted to other people and they don't go around telling them. It is not dishonest, it would be really weird socially if everyone did that.

So yes, go have yfs, enjoy them and they will enjoy you and both of your lives will be richer and better for it.

On an unrelated note I am surprised my nick is no longer registered.