Bloodbending Pump - Katara X Toph (Patreon)

On the night of a full moon, Katara and Toph sneak away to take the latter's training to the next level. Katara is well practiced, careful and... relatively safe. Squeezing Toph's muscles without her input, forcing intense flexes and pumps is agony to the earth-bender who stubbornly endures. Partly to show off, partly to improve her strength, partly to keep feeling the soft fingertips and body of her bloodbending assistant.