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.
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Toranoana
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E-Hentai