I see... It's to make your lovely breasts bigger...

My desire to help you is tremendous, but...

If we assume that each rub will add 0.01cm... No, if we consider my technique, let's say 0.1cm.

In that case, 10 rubs will put you 1cm closer to big breasts....

These are Kyonko-san's divine breasts, so I'll be permitted 38 rubs... and so 3.8cm...

If I restrain myself to 2cm... No! If it's just 20 rubs, it'll take only a moment! Only three seconds!

Ah, I know! I'll do one rub per day... and if I'm careful, half a rub?!

She's no good. If I don't do something soon...