Question: is this bl? Can I expect romantic relationship here?

yes of course it's bl, it says shounen ai on the genre u can see it :

Yep it’s bl, though very slice of life. There isn’t much real romance going on, just mostly dudes being dudes, friendship/relationship developments, a brief moment of a “sexuality crisis”, and a good amount of I would say “fan services” or interpreted romantic gestures. Highly recommend it

It's funny but has enough emotional chapters to balance it all out
Definitely worth reading
Trust me
You won't regret it

It start as more Slice of life, when you kind confused are they really in love or it's just random bromance moments. Hovewer after some time it's became more and more like BL, when they actually confess to each other and stuff...