His hips jerk a little at the friction, hitching up slowly so as not to displace Kirk from his lap to mirror the motion. A flush settles heavily on Caboose's cheeks as a trill of a shiver follows Kirk's fingertips around and up his body. Muscles twitching under the sweet touches, Caboose lets out a soft gasp and lets his head fall to Kirk's shoulder, arms tightening around his lover to hold him closer as he continues to grind up against his warmth.

"Mmn... I- I'd do anything for you, Jim." he smiles sweetly up at his Captain, blush be damned.