Biribiri♂Yankee, Hameraretemasu

Mitsutora was struck by lightning when he was young and gained the ability to generate electricity. Science teacher, Shinozaki, finds out about his secret and wants to study his body! Mitsutora resists Shinozaki's kisses and electrifies him but Shinozaki's actions continue to escalate as he penetrates Mitsutora's ass with his fingers!

(Source: Frontier Works, translated)

Note: Includes an extra chapter.