Just gonna PSA that breathplay is not safe. That said, the safest way to do it is to push UP under the jaw, which should still induce the sensation without constricting blood vessels. But also there are a lot of other ways to achieve that kind of arousal that aren't dangerous. NEVER press longer than a couple seconds. Also just like don't do breathplay. Use the sides of the neck or the face and ears for intensity.
Just gonna PSA that breathplay is not safe. That said, the safest way to do it is to push UP under the jaw, which should still induce the sensation without constricting blood vessels. But also there are a lot of other ways to achieve that kind of arousal that aren't dangerous. NEVER press longer than a couple seconds. Also just like don't do breathplay. Use the sides of the neck or the face and ears for intensity.