The 'infection' spreads.

Ally had to meet with Lucy, who was in charge of the big account from Taiwan.
Now she was the most important person in her life.

She got alone with Lucy and kissed her.
Her co-worker did not resist.

It turned out that Lucy was bi-curious.
Ally's ability to 'infect' others grew the more she did it.

It was exponential.

As the Office Liaison, she had to meet with just about everyone in the Office.

She kissed more lips than a dozen lesbians before 4pm.

Her most recent 'infectee' was Abby, who confessed to having a thing for Ryan.
Ally agreed to help her.

She called her in and Abby showed off her lingerie to Don's Wife, talking about how hot she thought the young lady was.
Ryan was nervous.

She was too nervous.
Ally and Abby were too direct.

She ended up face to face with the latter, who began to kiss her.
She looked to Ally for help, but found none.

The infection is as strong as the infector.
Ally's infection is overwhelming.

She gives the duo some 'alone time' and locks the door behind her.

Nobody need see their private affair right now.

At a different Office, Don is mentally planning out the Threesome he's expecting tonight.
He's in the dark.