If it's just trivial stuff then sure you can go for it, but who in their right mind would 'try' BDSM when you don't know anything about it?
When seme FORMALLY asked him for consent, was that a joke to u? BDSM should not be taken lightly, it even has a 'safe word' bc things can go violent and unbearable.
It involves mental, emotional preparation, as well as physical (he literally got bruises on his neck, wrists from being tied up on previous chapters).