Looking for a yaoi manga, forgot the name. T_T

I can't remember the main characters names, however I can remember a good amount of information...

The uke is a bit of an air head, while the seme is protective of him. They are both in college and the seme is told by a classmate that the uke was groped on the train, she also gave him a piece of candy as she didn't know what to say to the uke after the noticing the incident. She also tells seme the be careful of "Professor Andou" (the only name I can remember from the manga and useless in trying to find it). The seme ends up having a scary face and going to find the uke, while then some teacher asked him to return a book to the Andou's room, in which he does and finds the uke there after Andou had a little fun with him, which then causes the seme to snap and proceeds to have his way with the uke (in deliciousness).

Later on the seme wants to distance himself to prevent having his way with the uke again, however they go on a trip to visit the uke's family's inn (his sister and her husband work there) where the seme then has a nice fantasy in the onsen with the uke, only to snap back to reality and they go to the same room, where the uke then tells the seme that he notices the distance (or something like that) and wants to get closer the seme, which the seme accepts and then into more delicious scenes. When they leave the next morning the uke's sister mentions to the seme that she noticed them washing the sheets early in the morning and doesn't mind their relationship.


Random information
Uke has black hair.
Seme has light hair, usually tied in a pony tail and not too long... just about neck/shoulder length when taken out (which he does when first having his way with the uke.

~I believe this manga was ongoing when I last read it, but I have no idea if it's completed now~