The voices are all wrong. I love nagatoro but I really don't think this should be an anime. I wish nagato would go back to its roots where senpai was a self insert, nagatoro wasn't friends with a bunch of sluts, and the whole work was about sfw femdom only true enthusiasts could enjoy.
>nagatoro is a cuckoldress
Nagatoro isn't a real female. In the real world yeah the whole thing would just be her just investing in senpai so she has a fall guy if being a slut doesn't work out, but shes not real. In the manga its shes always turning down other guys and isn't interested in the slutty life her friends have. She also loves senpai despite his failings and works to protect/take care of him, instead of the pick-me lip-service you'd get in the real world. In the real world you'd have to pay out the ass to get the attention she's giving out.