1x2 - Fairy Tail OVA (2016)

Some of the Fairy Tail members visit the hot springs for relaxation. Mavis joins the girls in their bath but reveals that she can only enjoy the atmosphere, not the qualities of the water. Erza calls over Natsu from the men's bath, causing the other girls to exit the bath in embarrassment, and tells him their problem. The Dragon Slayer immediately uses his Magic to drastically raise the temperature of the water, so much so that Mavis is finally able to experience the warmth to her great joy and excitement.