Could someone translate this please? I'm quite curious about what it says.^^

Poor Mio.. D:
I hate seeing my favorite characters being raped and they can't do anything about it. x.x;

Remember, they go to an All Girls School

so it's either one of the teachers or a strapon.

I'll go with strap-on because it's a girl holding her down.

Not necessarily, since this obviously has a bit of sadism born possibly from malice, or the girl could just be into helping that kind of thing.....but the strap on theor would make an odd amount of sense, since one could actually make a form with that.....and has the added benefit of the cruel implications that they do not "empty the box" until the end of the day....

i dont think its a strap on because there's a vain on it

It's probably Mugi and Yui holding Mio down