Also I want a story of azumas friend!!!
There is a story about his friend. It's actually the prequel, I think.
http://www.mangago.zone/read-manga/yowamushi_danshi_renai_hajimemasu/
I noticed the same thing! Sano grew in the last couple chapters.
so he actually did get taller somehow i thought i remembered wrong
I think Sano is actually really taller by a few cm than Azuma. Whenever he appears smaller, it's kinda to depict him being overwhelmed by Azuma's aura/personality/coolness/pace.
I love how sano is so supportive n obsessed of azuma, u don’t see that often in bl. Also, idk if it’s just my eyes but I thought sano was shorter than azuma but then he suddenly grew??? lol idk... and azuma reminds me of kise from Kuroko no basuke while sano kinda reminds me of eren from aot xD