Oboreru Kiss ni Yowasarete

Yota Inaba is a new employee at an sex-toy company, and his biggest problem is that he can't get results at work.
One day, at a company party, he learned that his boss, Shiba, is a kisser when drunk, and when Yota found himself on the receiving end of a deep kiss, he couldn't help but get an erection! He rusheed to the bathroom to take care of it, but Shiba caught up to him and said, "Don't be afraid to touch me..." and started playing with him...?

(Source: Kasakura Shuppansha, translated)

Note: Includes chapter 7.5.