Laughing brightly beneath the summer sun, Rossweisse splashes water toward you without mercy as the two of you play together in the ocean. Seeing the usually reserved Valkyrie smiling so openly makes the moment feel even more special.
https://www.deviantart.com/kingofhistory/art/The-Valkyries-Splash-Attack-1334579295
It was a bright summer day at the beach, a rare chance for the Occult Research Club to relax together. Rias Gremory stepped onto the sand wrapped in a long red towel, drawing Issei’s attention before casually tossing it aside to reveal a bikini styled like the Welsh flag. She made it clear she’d bought it specially during her trip to Wales—and that she was showing it off just for him.
Sunset version As the sun dipped toward the horizon, the beach was washed in warm gold and amber light, turning the evening calm and intimate. Rias Gremory stepped onto the sand wrapped in a long red towel, pausing just long enough for Issei to notice before gently tossing it aside. Beneath it, she revealed a bikini styled like the Welsh flag—something she’d bought during her trip to Wales and saved for this moment.
She smiled at Issei as the sunset reflected in her eyes, clearly showing it off just for him. Issei was left speechless, caught between embarrassment and quiet admiration, while Rias watched his reaction with soft amusement. With the waves rolling in and the sky fading into dusk, the moment felt less like teasing and more like a shared, romantic memory at the end of a perfect summer day.
This was done by DCelestial a few months ago. I have nude versions of both but unfortunately it cannot be show because of the rules, sorry.
Link included nude but is censored, again sorry.
https://www.deviantart.com/kingofhistory/art/Rias-Devotion-to-her-Red-Dragon-1292425251