There are many leeches at TTHS; I met one after lunch who wanted me to go with him AND tutor him. A bit much, don't you think? I declined to go with him, but I offered to tutor him. That repelled him.
A leech is like a roach but more insulting. No one likes a leech. they are most likely dirty and nasty and always ask for things. Usually girls. They are very loud and annoying and nobody likes them except for other leeches or worst, a roach.