Without an arm to shove Cap's hands away, Jasper let him tug, tearing his fangs deep through Cap's muscle and worrying the wound around the shard through his thigh. Between them, the blood ran thickly, making Jasper lurch forward against Cap's tug, snarling like a dog over a bone.
There was no little taste here. There was big, hungry gulps; there was thoughtful blood donation and there was full body donated to science, and Jasper was eagerly making the leap. Nothing tasted or felt as good as real, human blood; he could feel it spread through him like he had a heartbeat of his own, like he could be warm for the first time in weeks, if he drank enough maybe he could be alive.