Her actions make him press closer, with a bruising kiss against her throat. He's not as vocal as she is, but Loki certainly has little tells that he's enjoying. The way he leans into a touch, or quiet little groans. He happily repays her actions in kind; now that he knows her shape, clever fingers get to work. Teasing her intimately, caressing and stroking and then entering her while his thumb focuses on her center.