How do I confess to my teacher

So I've got a bf , and his dad is my teacher . I visited my bf at his house and went to the toilet but accidentally saw his dad(my teacher's) d*ck and it was fucking my type then He got so embarrassed and had a cute expression on And . So I now can't stop comparing him with my bf's . I started finding my teacher attractive and I visit them everyday .
I watch my teacher the whole time and I study his subject a lot just to catch his eyes.
I wanna be his... I thought about confession but I think it would be complicated...should I seduce him ?