Closer than intended (TsukkiYama)

Tsukishima always lived in a closed minded household. His mother was homophobic, his brother on the other hand was very supportive of the LGBTQ+ community. His father left them around the time Tsukishima was born so he's never met his dad, it's always just been the three of them for years. Akiteru always told Kei to keep an open mind, his mother always told him what's right and what's wrong in life, and the LGBTQ community wasn't in the 'right' section. Tsukishima learned how horrible his mother is at a young age. Akiteru had brought a friend over..a special friend is how Akiteru would explain it to Kei. When Tsukishima met Yamaguchi he kept his distance for awhile, his mother of course liked this approach however his brother told him that he should spend more time with the freckled boy. Tsukishima took Akiteru's advice over his mother's and hung out with Tadashi more. They had sleep overs almost every week, they went to parks, they played pretend, all the normal things young kids love to do with their best friends. As the years went by he hung out and got closer to Yamaguchi, he realized while he was in high school that he might have feelings for the boy. He of course didn't tell his mother, he instead told his brother and his brother helped him through the whole mess of feelings. What do you think would happen if his mother found out?

Triggers:
Homophobic slurs
Cursing
Abuse