Looking for a bl manga

Help! I might be blind! I’ve been going through the list of all the oldie bl manga several times but couldn’t find it . Trying my luck here.
I remember reading it like yearssss ago. It’s about high school students (a senior and junior). The junior like his senior and told him so and went away straight after without hearing the senior reply. The senior was shocked but doesn’t care because typical, “he likes girls” he said to himself. The junior often goes to the senior’s class with his friend to casually say hi and joking around. If I’m not mistaken his friend is going out with that senior’s friend.
One scene I remember is the junior joking around by putting balloons in his clothes to make it look like booba and then asked the senior to try touching it.
And the senior is a total jerk.
Anyone has any ideas?