While admiral doesn't know it, Tenryuu is having NTR sex with an engineer.

提督が知らないところでヤリチン整備士との浮気セックスにドハマりした艦これの天龍 | Teitoku ga Shiranai Tokoro de Yarichin Seibishi to no Uwaki Sex ni Dohamari Shita KanColle no Tenryuu