All credit goes to PrinceBlueMoon3 as the artist, I am merely the uploader

"Yeah. Some of you guys wanted a Yona and Sandbar picture that resembled their others friends indulging in…. Well… Thickness. So I decided to draw this to give what you guys wanted. After a good long vacation, Yona sees her friend Sandbar may have enjoyed those sweets a little too much. Considering that the other students who got chunky were the females of the group, I figured I should at least make one of the male characters chunky. In this case, Yona with Sandbar is like Gallus with Silverstream in terms of one partner becoming a chubby. Though Sandbar is nowhere near as big as Silverstream. And just like Gallus, Yona doesn't mind her friend letting loose with his weight. In fact she secretly finds it cute." ~ PrinceBluemoon3