GVG-530 - Sex toy for crazy uncle Yua Nanami

It does what it's supposed to do, but it's a shame the actor playing the brother can't stay hard. Yua's age setting is ambiguous, the chapter titles don't give a clue about the content, and they don't even make good use of the suspension or restraints—I don't get the point. Honestly, a training/domination piece where the guy can't get it up is a dealbreaker. The quality of actresses has improved significantly, so I really hope they push the envelope and make something truly erotic.