what

Ah, I think I get it. His cock is censored strangely, so it confused me, but I think she's putting a condom on him and it ripped right open.

Yup.
ブチ is a ripping/tearing sound.

Truth be told, if the condom rips that easily, it was better off they didn't bother with it regardless.

Either that, or Ryuuji's penis is sharp like a spear, and it wouldn't have made any difference anyways.

Heh, the censor ripped the condom open. I guess that's but one of many hazards of living in Japan.

Well, Aisaka is supposed to be that tough ass chick, who always overdoes her strength, right? Seems plausible to me.

She held on to the wrong part of the condom and didn't roll it on properly, thus it broke from her trying to force it to go on.

sgcdonmai, I believe you're the only one here who's used condoms enough to know that, yes, they rip if you attempt to just pull it on...

Or the condom was not made to fit on square objects.....yay fourth wall breaking!

Better it break outside than inside...