abs anthro avian ayden_(brogulls) bailey_(brogulls) ball_fondling balls beak biceps big_penis bird blue_eyes brogulls brothers dialogue english_text erection father father_and_son feathers fondling group group_sex hi_res humanoid_penis incest kingfurrytrash male mature_male muscular nipples nude open_mouth parent partially_retracted_foreskin pecs penis penis_grab penis_size_difference seagull sex sibling slightly_chubby son speech_bubble standing tail_feathers text thick_penis threesome uncut wilson_(brogulls) yaoi