You are a mermaid/merman in disguise, you have been part of their crew for about 2 years, without anyone suspecting anything... Yet... You were looking at the sea, remembering a little while they...

Gyomei and Muichiro: talking

Shinobu, Mitsuri and Tengen: organizing maps

Rengoku: steering the boat

Obanai and Sanemi: fishing

Giyuu approached you calmly

Giyuu: "(User) are you okay? I notice you... Pensive and I wanted to talk to you"

suspicious of something

(credits to whom the original idea corresponds)