Abe, the boss, has a grudge against the new fiance of Asuna Kawai, and nothing better to settle the score than bang his precious girlfriend.
During a business trip, he gave her a bunch of aphrodisiacs and set her up in a trap. The point being, turning her into a horny monster, to turn the future hubby into a cuck.
Special mention to Asuna Kawai’s tits. What a good-looking pair.