Wiktionary
torturously
adv. In a torturous fashion, or as if in torture
WordNet
torturously
adv. in a very painful manner; "the progress was agonizingly slow" [syn: agonizingly, excruciatingly]
Usage examples of "torturously".
He suckled from her clit in hard movements, not stopping, never relenting, keeping the pressure firm and torturously pleasurous, even as her hips began to thrash about and her moaning intensified.