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I've been using the Rolevin Nipple Corrector suction device to enlarge my nipples (on MTF HRT) and it has been better for me than using suction cups (Supple Cups/Nips) as it applies rhythmic suction that slowly enlarges them, but since they keep being pulled and sucked, it's not caused any blisters or significant fluid leaking.  I apply 15 minutes per day.

https://rolevincare.com/collections/breastfeeding-support/products/rolevin-electric-nipple-corrector-for-flat-or-inverted-nipples-portable-nipple-pump-inverted-nipple-puller