To Love Ru Darkness Vol. 16 (manga)

A TROUBLESOME STOWAWAY

After Nemesis was defeated by the King of Deviluke, Rito thought his life might settle back to normal. Or at least his version of normal, full of alien mad scientists trying to conscript him into a harem! But there's a flaw in his logic: he absorbed Nemesis into himself to save her, remember? And now, as she begins to recover, she's enjoying taking control of his body at very inopportune times...