forgot the name of this bl manga

the manga had multiple stories and one of them was like the main character was like a senior or a second year and his childhood friend was a first year but he looked really scary and tall but has a cute name/ nickname (i think). i remember that the mc always thought of the childhood friend as cute when he wanted to be cool in the mcs eyes. the mc thinks his childhood friend got a girlfriend but when the childhood friend confesses their feelings to him, they think it’s just practise and then they kiss and he also thinks it’s like practise for his gf.

another story was like a 10 year age gap where they said they were going to marry when they were kids and the younger one confesses when they’re like 20 and the older one pretends they don’t like them or something.

i’m sorry if this is confusing but if you know it, please let me know