Yep, and now time for a few more experiments.

Maximus felt somewhat relieved as he donned his backpack and left the office space. While he now could prevent himself from having unwanted erections, his balls would get uncomfortably full after about 2-3 hours. He'd gone to the restroom to unload twice, once just before leaving work. Waiting longer clearly increased how much he came, and he now had four full repurposed pickle jars with a disturbing mix of condoms and cum sealed inside them, clinking gently in his backpack as he walked.

He wasn't sure what he'd end up doing with it, or how/if he should store the stuff, but cum had been one of the constants in Barbara's physical (and mental?) changes over a relatively short 48 hour period, and he wanted to do some tests.

After arriving home, Maximus decided to get some notes on his new reality written down before anything else.
He wasn't sure if it was necessary, but he put the notes in an encrypted password protected document, stored on his old laptop that he wasn't using anymore, partially because it's wi-fi connection no longer functioned, but mainly because he had wanted a better one, and used that as an excuse.

Known facts:

• I came on myself in my sleep.

• My cum thus came into contact with my skin (mainly groin area)

• This apparently caused my body, especially genitalia, to transform slowly while I was at work and did not notice. (not proven, but plausible assumption)

• This led to additional contact with my cum, multiple times. But only externally - skin contact.

• Barbara (boss at work) walked in on me masturbating in the restroom, and quite literally took a load to the face.

• She proceeded to eat a large amount of it, and the time between contact and consumption was very short, so either she had an existing fetish for eating cum, or the changes are much faster than I think.

• Her breasts grew in size.

• Her hips grew wider.

• Her ass grew bigger, but also...firmer?

• Her waist grew smaller/narrower.

• Her throat was capable of taking 15 inches of wrist-thick cock to the root. This likely was not the case before, but that is an unknown.

• Her interest in me, focused on my vastly increased cock, and especially cum, may be more than previous Barbara might have expressed. Certainly she sent people home from work early, potentially creating a situation where the company might lose money. No previous indications that old Barbara would even consider, let alone do, such a thing.

• All of these changes fit or approach various aspects of fantasies I've had about her in the past.

• Most importantly, the last two days have led to me realizing at least some potential control over these changes.

• I was thinking how problematic having an erection that won't go down in some situations is, and it went down immediately.

• Come to think of it, I don't know what exactly the change is.

Maximus looked down at his cock, a massive somewhat floppy tube of flesh, laying on the chair between his legs. He tried imagining Barbara under his desk blowing him, not too hard considering what had happened 6 hours ago.
Nothing.
He concentrated on willing it to be erect, while also doing math in his head.
It sprang to attention in seconds.

Going back to his notes, he entered another line:

• After some minimal testing, it appears I can now control when/if I get an erection. Does that mean no morning wake up blowjobs, if I ever have someone sleep over?
• Specifically, when thinking of arousing things (Barbara/Barb kneeling under my desk giving me a blow job), I did not get an erection.
• And, while willing an erection to occur and doing math in my head, I did get an erection.
• Further testing may be needed.

He started trying to describe this whole weird...thing...by some set of rules/guidelines.

1. My body (and mind?) transform/change when I come in contact with my cum in any way.
2. The bodies (and minds?) of other people transform and change when they come in contact with my cum in any way.
3. The changes seem faster if my cum is taken internally (only ingestion tested so far, and not on self).
4. The changes seem to be controlled by fantasies, especially sexual, that I have. Although some of them I was not aware of until noticing the changes.
5. Consciously thinking of a different version of previous fantasies appears to allow some changes, but the specifics of this are yet to be discovered.

This was all he had for now, and there were plenty of unknowns, such as whether the affect had a time limit, or only worked when fresh.

He briefly fantasized about his housemate "accidentally" consuming or touching his cum as a test. He'd always had a small crush on her, even though she barely recognized he existed, apart from ensuring he paid the rent and kept the shared portions of the dwelling clean.

Small crush, but extensive and in some cases probably crazy fantasies. Actually, he wasn't sure if he had a crush on her, or on the fantasies.