Could someone help find a story

I really hope someone can help. I was reading this story, I think the main character is named Mark, but I'm not sure. He lives with his aunt and cousin, he has social issues where sarcassim evades him. He hooks up with his teacher because she finds out he has a huge penis. He works as an aircondition installer and heating and air repair company. Through his work he hooks up with mature women.

I was reading this story and had a power serge and it fried my computer and in getting a new one I lost the story. Please if anyone can help I would really appreciate it.

Mark threw me off for a minute, but based on the rest of the description, I think you are looking for BurntRedstone's "One Who Understands" the first in his trilogy about Ed who was known as Mister Ed because of his endowment.

Thank you. Yes this is what I was looking for.