Title: [E-10 Field (Etosei)] Nyaruko to Shabon (Haiyore! Nyaruko-san)
JPN Title: [E-10フィールド (干支政)] ニャル子と射本 (這いよれ！ニャル子さん)
A nice parody of the Catherine cover.
I guess Mahiro failed his saving throw and ended up mutating into a Lovecraftian sex monster. Refreshing to see male corruption every now and then.
You can view it here