If I roll Astolfo I'm going to feed him single 1* EXP card at a time to have the slowest and longest mana transfer possible.

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Take him into my room and strip him down to only his thigh highs. Tie his hands to edge off the headboard and force him to stand while I lean over him from behind, nibbling on his ears & licking up his back to the nape of his neck with my exp resting over his butt at half mast. Astolfo begging me to level him up, his sword leading uncontrollably creating a viscous puddle on floor.

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I'd slowly stick my long and thick EXP into his boypussy, pushing it until he receives me all the way down to the base. Holding it there so it's just enough for him to feel it, but not moving to withhold him from leveling. Then I'd play with his nipples and hook my fingers in his mouth until he kicks uncontrollably trying reach the next level while the pool on the floor grows lager. The height difference is great enough to be able to see his face as he licks and drool all over my fingers.

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Still giving the experience from behind I'd lift him up by his torso and tell him to wrap his legs around me. Pounding in the experience as fast as possible while his legs cling on for dear life. Then when he's close to the next level, cut down the ropes and lay him on the bed holding the experience as deep as I can while laying on top of him and whispering everything he said, while begging to be fed, into his ear until him imagination cause him to finally reach the threshold and hit the next level.