feeding second mouse

[Bogertophis]

Some of my thoughts: (BTW, how long have you had this snake?) Sorry for long post but there are many factors to consider.

BPs are ambush-predators, meaning they prefer to hide in a secure location & grab clueless prey that happens to pass by; they are NOT active hunters. So with a pet BP, you want to duplicate that process as much as possible.

Best results for most BPs- feed in evening/after dark; dim lights (at most) in the room; wait until he's peeking out of his hide (that's what a "hunting" BP looks like); understand that they feel way too exposed* to eat if you offer them food when they're openly cruising their cage- *snakes are predators, but while they're busy eating, other animals may find them to be a tasty meal too.

Don't offer meals too close together- if he refuses a meal, wait at least a week before offering again. Offering too soon just stresses them into more refusals.

A snake that "seems afraid" of their f/t (frozen-thawed) prey may also be going into a shed cycle; they can obviously feel this before we can actually see any indication, so that's another good reason to wait at least a week after your BP refuses food- by that time, if he's in shed, it will be obvious, & it's best not to bother offering a meal- wait until after he sheds. Most won't eat when in shed, but even if they do, it can mess up their shed, because both digestion and shedding requires good hydration from the snake's body- many can't do both easily at the same time. If he's not in shed, he might then be hungry.

Another reason that snakes are picky eaters is when they're being handled too much. Might this be the case? Since you mention he has always been picky, I wonder how often you're handling him? And I'd recommend you do NO handling for a couple days before you plan to feed him- see if that helps? (along with following the other suggestions as to time, & methods)

Another appetite-killer is if his cage temps aren't warm enough- what's the temperature range in his home, both the highest & lowest? Are you using an overhead light, by any chance? (ambient room light only is best- they don't like bright lights)

No way to tell you how long a snake will stay in "feed mode" & accept a second prey item. They're all individuals- some will & some won't, & especially with a BP, many just won't. Better to plan to only feed one item of correct size per meal.

Thawing correctly matters: thaw in 'fridge or in cold water (< fastest way!) until soft thru-out (check this by hand); then & only then warm it up rapidly (to avoid spoilage-remember BPs want fresh prey, not carrion) briefly using very warm water immersion, & many here have great success also using a blow dryer right before offering.

Remember BPs rely on their heat-sensing pits- you need to duplicate life-like warmth for most BPs to want to eat f/t prey. Again, don't thaw in hot water the whole time, as it promotes spoilage that your snake can smell, even if you can't- thaw cold, then warm & offer quickly -at night in a dim room- before it cools.

How you offer matters: some snakes prefer to be "drop fed" (leave prey just outside their hide & they'll eat later when lights are out & you're not watching them). Unfortunately BPs also like their prey to be warm & life-like, & f/t rodents cool off quickly & are often un-eaten when offered this way.

Many others accept f/t from tongs IF offered when they're peeking out of their hide, at night, as long as you don't make the rodent appear too lively, & never approach the snake with it. The idea is to elicit the snake to chase after the prey just a little bit.

Snakes rely on instincts to survive, & rodents that appear to approach them will SCARE them -as that's NOT what real life rodents do- they run the other way. So if you're using tongs to offer prey, you want to give a slight jiggle to the prey & make it look like it's just passing by, a little out of reach from where the snake is hiding. This way, a hungry BP will feel secure enough to grab the prey- then be sure to let go, lol.
BTW,