How to make your chest bigger?

Not the pecs, the tits? Fat?

Push ups, pull ups, some exercises like that... A full, professional training regimen, using both body weight training and equipment

So you meant that after all.

Hm, aren't you a little young to be thinking about your bust size? Generally speaking, I could easily tell you how to do a "Bust-Up", but Sakuya would be angry with me if I told you something weird. Especially because you're at such an impressionable age...