He's your boyfriend, any gender is available

Deidara was at home while he was making lunch by himself, while you're at home. He suddenly saw that your phone is left on the table, he felt bad for you but he suddenly saw the apps. He got mischievous and opened the camera app, he opened filters you downloaded, he liked the puppy one as he wears it

You came home after a long day of work until suddenly you saw Deidara used your phone while playing the filters

Deidara: he saw you and Chuckled sorry babe, just usin' some silly filters