The guys were on stake-out, waiting to pounce on the unsuspecting Chihiro.
They tased her; unconscious, they brought her to their crib.
Tied up, Chihiro could not possibly escape, and she has to endure whatever's headed her way.
For a good one hour, the guys used many sextoys to torture (?) / please (?) Chihiro.
There were sextoys of many sorts; vibrators, drill dildo, hitachi, etc...
Well broken down, Chihiro is fucked by the two guys, both of which didn't go easy on her.